Strong modulations of optical reflectance in tapered core-shell nanowires

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Date
2019-10-31
Authors
Floris, Francesco
Lucia, Fornasari
Vittorio, Bellani
Marini, Andrea
Banfi, Francesco
Marabelli, Franco
Beltram, Fabio
Ercolani, Daniele
Battiato, Sergio
Sorba, Lucia
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MDPI AG
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Abstract
Random assemblies of vertically aligned core–shell GaAs–AlGaAs nanowires displayed an optical response dominated by strong oscillations of the reflected light as a function of the incident angle. In particular, angle-resolved specular reflectance measurements showed the occurrence of periodic modulations in the polarization-resolved spectra of reflected light for a surprisingly wide range of incident angles. Numerical simulations allowed for identifying the geometrical features of the core–shell nanowires leading to the observed oscillatory effects in terms of core and shell thickness as well as the tapering of the nanostructure. The present results indicate that randomly displaced ensembles of nanoscale heterostructures made of III–V semiconductors can operate as optical metamirrors, with potential for sensing applications.
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Keywords
Core-shell , Nanowires , Semiconductors , Optical reflectance , Numerical simulations
Citation
Floris, F., Fornasari, L., Bellani, V., Marini, A., Banfi, F., Marabelli, F., Beltram, F., Ercolani, D., Battiato, S., Sorba, L. and Rossella, F. (2019) 'Strong Modulations of Optical Reflectance in Tapered Core–Shell Nanowires', Materials, 12(21), 3572. (11pp.) doi: 10.3390/ma12213572